I'm not sure why, most D&D series I've watched on youtube all take themselves very seriously, with few instances of wacky hijinks. The exception being Dimension 20 D&D shows, which are short form campaigns made by comedians specifically.
I think people here are in danger of confusing a "beer and chips" style game, which is more focused on having an adventurous fun romp (Princess Bride style, not too serious, and relatively low risk, but still an adventure), with a deliberately comedic wacky hijinks game like Dungeon and Daddies.
